TWSBI fountain pens are loved for their high quality and affordability, offering advanced filling mechanisms normally reserved for much more expensive fountain pens. The TWSBI ECO (short for "economical") provides the same high-quality, high-capacity piston filler as the Diamond 580 at an even lower price. It features a sleek, transparent barrel and a hexagonal screw-on cap that posts securely on the back of the pen.
